A.J. Jenkins, WR, San Francisco 49ers

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A.J. Jenkins has had a rough go of it since entering the NFL. Upon being drafted, he was criticized as a reach. And so far, he has done nothing to shed the label.

Jenkins hasn't recorded a catch yet and has been inactive two of the first three weeks. There have been few positive reports about Jenkins, and his inability to gain playing time among a weak wide receiver group shows how much he has struggled.

It's too early to say Jenkins is undoubtedly a bust, but the early signs aren't good. In fact, he is progressing just as many predicted the surprise first-rounder would.

Bruce Irvin, DE, Seattle Seahawks

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Bruce Irvin had a great game against Green Bay, picking up two sacks. However, he was going up against Bryan Bulaga, who isn't the best in pass protection.

Irvin has actually played reasonably well thus far, but he is still a one-trick pony. In order to last in the NFL, Irvin will need to add more pass-rush moves and improve against the run. He has failed to do either as of yet.

If he does progress, Irvin has the skills to make it as a pass-rusher. As of now, though, he is too one-dimensional. Offensive tackles will figure out Irvin's game if he fails to adjust.

Dre Kirkpatrick, CB, Cincinnati Bengals

Dre Kirkpatrick missed much of Cincinnati's offseason activities with a knee injury, which he still hasn't recovered from. That's not a good sign for the talented rookie.

Kirkpatrick was always a risky draft pick, as no one knew how his lanky frame would adjust to the NFL. The injury issues make him even more likely to bust now.

There's a good chance Kirkpatrick will recover from his injury and see the field yet this year. However, early injuries—especially knee injuries—aren't good indications of future health. The injury risk, combined with Kirkpatrick's risky skill set, makes him a good bust candidate.